MSDE or SQL

I was asked today by a client about the fiesability of using the MSDE insted of a full SQL server.
The main reasons for him to do this were primery the cost reduction of the system and the secound was the volum of data that he needed on the server, wich was low since it is a legacy system.
When i got to check it i could not get a simple Yes No answere.
i have digged into the subject and found some nice pages (page1,page2) to summerize the usability of the MSDE and its limitation.
i still havent found the comparison i wanted to eliminate the need for explanations.
If you know of one to help me out then tell me about it.